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lungs × 74covid-19 × 11
smoking × 11
respiratory-system × 11
breathing × 9
cancer × 6
air-quality × 6
infection × 5
pneumonia × 5
pulmonology × 5
virus × 4
disease × 3
lasting-effects-duration × 3
asthma × 3
oxygen × 3
smoke-inhalation × 3
immune-system × 2
cardiology × 2
infectious-diseases × 2
symptoms × 2
face-mask-respirator × 2
injury × 2
recreational-drugs × 2
pathophysiology × 2
oxygenation × 2